Keywords: fungal isolates, identifi cation, isolation, reclaimed soil
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1 58 Survey article Study of mycobiota diversity in some new reclaimed areas, Egypt Abdel-Nasser A. Zohri a, Waill A. Elkhateeb b, Mohamed B. Mazen b, Mohamed Hashem b, Ghoson M. Daba b a Department of Botany, Faculty of Science, Assiut University, Assiut, b D epartment of Chemistry of Microbial Natural Products, National Research Center, Giza, Egypt Correspondence to Waill A. Elkhateeb, PhD, Department of Chemistry of Microbial Natural Products, National Research Center, Tahrir Street, Dokki, Giza, Egypt Tel: ; fax: ; waillahmed@yahoo.com Received 17 December 2013 Accepted 23 February 2014 Egyptian Pharmaceutical Journal 2014, 13:58 63 The objective of this survey was to study the diversity of fungi, as they play an important role in knowing the quality and increase plant productivity. In this work, the chemical composition of samples in newly reclaimed localities at Assiut Governorate was studied; mycobiota of those areas were studied reporting some medically important substances produced by three fungal species, namely Aspergillus terreus, Emericella nidulans, and Penicillium chrysogenum, which recorded the highest occurrence all over the year in different studied areas. Soil samples were collected monthly for a whole year from the four selected reclaimed regions at Assiut Governorate, namely Protectorate of Assiut (PR), El-Ghorayeb (GH), El-Wady El-Assiuty (WA), and Petroleum s Farm (PF), and samples were identified using the morphological and microscopic features according to many references and confirmed by Assiut University Mycological Center (AUMC) followed by physiochemical analysis of, including measuring total soluble salts and determining the organic matter content, maximum and minimum temperatures, relative humidity, and texture. The highest numbers of fungal genera and species were recorded in PR followed by WA and PF, whereas the lowest numbers were recorded in GH. E. nidulans var. acristata and Penicillium funiculosum were isolated with moderate frequency from GH; Aspergillus aegyptiacus and Aspergillus ustus were isolated with moderate frequency from WA; A. aegyptiacus, Eurotium amstelodami, and Fusarium solani were isolated with moderate frequency from PF; Eurotium repens was isolated only from GH; Arthrinium sacchari, Cochliobolus sativus, and Fusarium xylarioides were isolated only from WA; Aspergillus deflectus, Penicillium expansum, and Rhizopus arrhizus were isolated only from PF; Aspergillus niger, Fusarilla indica, Fusarium semitectum, and Trimmatostroma eriodictyonis were isolated only from PR. There are no adequate mycological studies carried out to describe the fungal fl ora of these areas. Hence, any information on the endemic mycobiota is of great signifi cance. Keywords: fungal isolates, identifi cation, isolation, reclaimed Egypt Pharm J 13: Division of Pharmaceutical and Drug Industries Research, National Research Centre Introduction Many investigations have been carried out on the occurrence of s fungal isolates in many parts all over the world [1 8]. In Egypt, numerous investigations have been made on fungi from Upper Egypt, Delta area and Sinai Peninsula as well as from some Wadies at eastern desert of Egypt [9 15]. They found that members of Aspergillus, Penicillium, Fusarium, Mucor, and some dematiaceous Hyphomycetes were the most common in various types of Egyptian s. Mazen and Shaban [16] studied the fluctuation of fungi in wheat fields and found that the most common fungi isolated were Aspergillus (Aspergillus niger, Aspergillus terreus, Aspergillus fumigatus, Aspergillus flavus, Aspergillus versicolor), Humicola grisea, Fusarium solani, Fusarium oxysporum, Trichoderma viride, and Stachybotrys chartarum. Moubasher et al. [17] isolated 167 species and 10 varieties belonging to 45 genera from 100 samples collected from Wadi Bir-El-Ain, and the most common species were A. fumigatus, A. niger, A. terreus, and Aspergillus glaucus group (represented by Aspergillus amstelodami, Aspergillus chevalieri, Aspergillus ruber) and Penicillium chrysogenum. Abdel-Hafez et al. [14] isolated 122 species and nine varieties belonging to 36 genera from samples collected from Sinai Peninsula on glucose-czapek s agar at 28 C, and the most common species were A. flavus, A. flavus var. columnaris, A. fumigatus, Aspergillus nidulans, A. niger, A. terreus, Botryotrichum atrogriseum, Chaetomium globosum, F. solani, P. chrysogenum, and S. chartarum. Mazen et al. [18] mentioned that the occurrence of Fusarium spp. in Egyptian s was influenced by the type and by locality; they also noticed that the most common species were F. oxysporum, F. solani, Fusiform equiseti, Fusiform acuminatum, and Fusarium semitectum. Abdel-Hafez et al. [15] isolated 118 species in addition to seven varieties belonging to 51 genera from cultivated and desert s. The results obtained from the three type were basically similar, and the most common fungi were A. flavus, A. flavus var. columnaris, A. fumigatus, A. niger, Aspergillus sydowii, Division of Pharmaceutical and Drug Industries Research, National Research Centre DOI: /
2 Diversity of fungi Zohri et al. 59 A. terreus, B. atrogriseum, Cladosporium cladosporioides, Emericella quadrilineata, F. oxysporum, Gibberella fujikuroi, H. grisea, Nectria haematococca, P. chrysogenum, Penicillium citrinum, and Penicillium oxalicum. Most investigations have been made on the fungus flora of agricultural or forest s. Very few investigations have been carried out on the mycobiota of the newly reclaimed localities at Assiut Governorate. Protectorate of Assiut (PR), El-Ghorayeb (GH), El- Wady El-Assiuty (WA), and Petroleum s Farm (PF) represent the largest newly reclaimed areas at Assiut Governorate, cultivated with different important crops. There are no adequate mycological studies carried out to describe the fungal flora of these areas. Hence, any information of these areas on the endemic mycobiota is of great significance. Selected areas Four areas representing the largest and distinctive regions of newly reclaimed at Assiut Governorate were selected. These were PR that lies at 25 km southeast Assiut, GH that lies at 20 km southeast Assiut, WA that lies at 10 km east Assiut, and PF that lies at 10 km northwest Assiut. Collection of samples Soil samples Soil samples were collected monthly for a whole year from the four selected reclaimed regions at Assiut Governorate. Soil samples were collected from patches free from roots according to the method described by Johnson et al. [19] and could be summarized as the following: (1) A sample tube is used, which should be washed thoroughly before starting the sampling. Samples are taken to a depth of 5 inches and the is taken directly into clean and sterilized plastic bags (at least five samples are taken at random from each replication). (2) The five or more samples from each replication are brought together into one composite sample, which is mixed thoroughly. (3) Finally, 10 g (on an oven-dry basis) of the mixed composite samples are used for determining fungal counts by the dilution-plate method as recommended by Johnson et al. [19] and used in this laboratory by Moubasher et al. [5]. Chemical analysis of Total soluble salts The specific electrical conductance in the prepared extract was measured by means of conductance meter (YS1 Model 35); the total soluble salts (TSS) in the was estimated using the following equation % TSS in the dry = EC(m/cm) Extrack ratio. The conversion factor to percentage salts (0.064) was fairly applied for solutions extracted from alkaline and saline s [20,21]. Organic matter content The organic matter content of samples was determined by Jackson [20]. A certain amount of was digested by chromic acid (for oxidation of organic matter to CO 2 ) and the excess chromic acid was back titrated against standard ferrous sulfate solution in the presence of diphenylamine as an indicator. Ca 2+ and Mg 2+ The Versene (disodium dihydrogen ethylenediaminetetraacetic acid) titration method as recommended by Schwarzenbach and Biedermann [21] was used for Ca 2+ and Ca 2+ +Mg 2+ determination. Na + and K + Flame photometer method [22] using Carl Zeiss flame photometer was used for determination of cations such as Na + and K +. ph value A ph meter (WTW ph 90) was used for the determination of ph. The electrode was immersed in the suspension in a ratio of 1 : 5 (w/v) to avoid the error through higher dilution [21]. Maximum and minimum temperatures and relative humidity The values of maximum and minimum temperatures and relative humidity all over the year were obtained from Assiut Forecasting Authority. Determination of texture The type of each locality was determined by the hydrometer method as described by Piper [23] and used in this laboratory by Moubasher et al. [5]. Soil type was determined from the textural triangular as recommended by Alexander [24]. Isolation and identification of fungi Soil fungi The dilution-plate method was used to determine fungi as described by Johnson et al. [19] and used in this laboratory by Moubasher et al. [5] and can be summarized as follows:
3 60 Egyptian Pharmaceutical Journal (1) Soil to be diluted was sifted through a 9-mesh sieve. Three aliquots, each of 5 10 g, were placed in previously weighed metal container and dried overnight in an oven at 105 C. The aliquots were then reweighed and the moisture content of the sample was calculated. (2) Ten grams of sample (based on an oven-dry weighed ) was placed in a graduated cylinder, and sterilized distilled water was added to the so that a total volume of 100 ml was reached. The suspension was stirred and poured into 1000 ml Erlenmeyer flask. The flask containing the suspension was shaken on mechanical shaker for 30 min. (3) Ten milliliters of the suspension was immediately drawn (while in motion) using sterile Menzies dipper [25] and transferred immediately to a known volume of sterile distilled water blank until the desired final dilution was reached. Each suspension was shaken by hand for few minutes. (4) One milliliter of the desired dilution was transferred directly into each of the sterilized Petri dishes followed by ml of glucose-czapek s agar medium cooled to just above solidifying temperature. The dishes were rotated by hand in a broad swirling motion so that the diluted was dispersed in the agar. (5) Five plates were used for each sample and incubated at 28 ± 1 C for 7 days during which the developing colonies were identified and counted [expressed as colony forming unit (cfu)/g dry ]. (6) Glucose-Czapek s agar [26] used in this laboratory by Moubasher et al. [5] was used throughout the present investigation for isolation and identification of fungi. This media was supplemented with bacteriostatic agents. The composition of this medium is as follows: agar, 15.0 g; NaNO 3, 3.0 g; KH 2 PO 4, 1.0 g; MgSO 4 7H 2 O, 0.5 g; KCl, 0.5 g; FeSO 4 7H 2 O, 0.01 g; glucose, 10.0 g; and 1000 ml distilled water. (7) For further investigation, growing fungal species were obtained on slants of glucose-czapek s agar medium and kept in refrigerator at 4 C. Identification of fungal genera and species Identification of the isolated fungi during this investigation was carried out using the morphological and microscopic features according to the following reported books: (1) Ainsworth [27] as a dictionary of the fungi. (2) Barron [28] for the genera of Hyphomycetes. (3) Booth [29,30] for Fusarium spp. (4) Onions and Barron [31] for Paecilomyces spp. (5) Domsch et al. [32] for fungi in general. (6) Ellis [33,34] for dematiaceous Hyphomycetes. (7) Kendrick [35] for the genera of imperfect fungi. (8) Moubasher [36] for fungi in general. (9) Pitt [37] for Penicillium spp. (10) Raper and Fennell [38] for Aspergillus spp. (11) Rifai [39] for Trichoderma spp. (12) Simmons [40] for Alternaria and Ulocladium spp. (13) Zycha [41] for Mucorales. In addition, identification of the isolated fungi was reviewed and compared with the same species deposited in Assiut University Mycological Center (AUMC). Results and discussion Mycobiota of protectorate of assiut Thirty-three species and three species varieties belonging to 18 genera in addition to the fungi with sterile mycelia were isolated and identified during this study. Aspergillus was the most common genus, with 10 species in addition to one species variety. Results showed that A. flavus and Aspergillus japonicus were the most common species. A. terreus and Aspergillus aegyptiacus were also isolated in high frequencies, whereas A. sydowii and A. versicolor were isolated in moderate frequencies. Chaetomium was the second common genus and C. globosum was the commonest species. Emericella was the third commonest genus. The most common species and variety were Emericella nidulans and E. nidulans var. acristata. Penicillium and Stachybotrys were also isolated in high frequency, and the most common species were P. chrysogenum and S. chartarum. The remaining genera and species were isolated either in moderate, low, or rare frequency of occurrence as shown in Table 1. Mycobiota of El-Ghorayeb area Twenty-eight species and two species varieties belonging to 17 genera in addition to fungi with sterile mycelia were isolated and identified during this study. Aspergillus was the most frequent genus. Eight species were isolated and identified. A. japonicus ranked the first commonest species. A. flavus and A. terreus were also isolated with high (H) frequencies. The remaining species were isolated in moderate (M), low (L), or rare (R) frequencies of occurrence as in Table 1. Emericella came behind Aspergillus and the isolated species were as following: E. nidulans, E. nidulans var. acristata, and E. nidulans var. lata. Penicillium ranked the third genus, with two species, P. chrysogenum and Penicillium funiculosum, recorded in moderate frequencies. C. globosum in addition to the fungi with white sterile mycelia were recovered in moderate frequencies. The remaining genera and species were isolated either in low or rare frequencies of occurrence.
4 Diversity of fungi Zohri et al. 61 Table 1 Occurrence remark of fungi isolated from the different selected areas Genera and species El- El-Wady Petroleum s Protectorate Genera and species Ghorayeb El-Assiuty Farm of Assiut El- Ghorayeb El-Wady Petroleum s El-Assiuty Farm Protectorate of Assiut Acremonium strictum R R L M F. dimerum R Alternaria alternate L L F. graminearum R R Aspergillus aegyptiacus R M M H F. m. var. subglutinanas R A. carbonarius R Fusarium oxysporum R R M A. carneus R Fusarium solani L M Aspergillus defl ectus R F. sporotrichioids R A. fl avipes R Fusarium xylarioides R Aspergillus fl avus H M H H Gliocladium roseum R Aspergillus fl avus R Humicola fuscoatra R var. columnaris Aspergillus japonicus H M H H Humicola grisea R A. melleus R L Hypomyces R chrysospermus Aspergillus niger R Macrophomina L phaseolina A. ochraceus L R Memnoniella echinata R Aspergillus sydowii M H L M Mucor fuscus L R R A. tamari R R R M. circinelloids R Aspergillus terreus H H H H Myrothecium roridum R Aspergillus ustus R M H R M. verrucaria R L L R Aspergillus versicolor L R M M Papulaspora immerse R L Botryotrichum piluliferum R H M Penicillium brevicompactum R L M L Beltrania querna R Penicillium M M M M chrysogenum Chaetomium M H M H Penicillium citrinum L globosum C. spirale R R L P. corylophilum R R R Cladosporium R L L P. frequentans R cladosporioides C. herbarum R Penicillium M R funiculosum C. sphaerospermum R P. purpurogenum R R C. hawaiiensis R Pestalotia spp. R Cochliobolus spicifer L L M H Phoma glomerata L Cunninghamilla R R P. herbarum L echinulata C. elegans R L P. leveillei R Doratomyces L L M Rhizopus arrhizus R microsporus D. stemonitis R Rhizopus stolonifer L L M M Emericella nidulans H M H H Scopulariopsis brevicaulis L R E. nidulans var. acristata E. nidulans var. dentate M L L M Stachybotrys chartarum L Thermoascus aurantiacus L L M H L R R E. nidulans var. Lata L R T. harzianum R R Emericella quadrilineata L Trichothecium roseum R E. violacea R U. botrytis R Epicoccum nigrum R L U. chartarum L R Eurotium L L M R U. chlamydosporum R amstelodami F. culmorum R L H, high occurrence (more than 5 months along the year); L, low occurrence (2 months); R, rare occurrence (1 month); M, moderate occurrence (between 3 and 5 months).
5 62 Egyptian Pharmaceutical Journal Mycobiota of El-Wady El-Assiuty Thirty-seven species and one species variety belonging to 21 genera were isolated and identified. Aspergillus was the leader and A. japonicus was the most dominant among its eight isolated species followed by A. sydowii and A. terreus, whereas A. aegyptiacus, A. flavus, and Aspergillus ustus were isolated in moderate frequencies. The remaining species were detected in either low or rare frequencies of occurrence. Botryotrichum, Chaetomium, and Penicillium were also isolated in high frequencies, and Botryotrichum piluliferum, C. globosum, and P. chrysogenum were the most common species as can be seen in Table 1. E. nidulans and E. nidulans var. acristata were recorded in moderate frequencies. The remaining genera and species in addition to the fungi with dark sterile mycelia were isolated either in low or rare frequencies of occurrence. Mycobiota of Petroleum s Farm Fifty-six species and three species varieties belonging to 29 genera in addition to the fungi with sterile mycelia were isolated and identified during this study. The most common genus was Aspergillus and 11 species were isolated and identified. A. japonicus was the common species and A. terreus was the second common species isolated. A. flavus and A. ustus were also isolated in high frequencies, whereas the remaining Aspergillus spp. were isolated either in moderate, low, or rare frequencies. Emericella (three species and two varieties) and Fusarium (five species and one variety) in addition to the fungi with dark sterile mycelia were also isolated in high frequencies, and the most common species were E. nidulans, F. oxysporum, and F. solani. Penicillium (five species) was isolated in high frequency and the most common species was P. chrysogenum. B. piluliferum, Rhizopus stolonifer, C. globosum, Cochliobolus spicifer, Eurotium amstelodami, and S. chartarum in addition to the fungi with white sterile mycelia were isolated in moderate frequencies. The remaining genera and species were isolated in either low or rare frequencies of occurrence as shown in Table 1. Few investigations have been carried out on the mycobiota of the newly reclaimed areas at Assiut Governorate especially in four reclaimed areas, namely GH, WA, PF, and PR. Analysis of some biotic factors such as TSS, organic matter, and ph of the studied samples demonstrated that amount of TSS was varied depending on the area and fluctuated between 1.58 and 2.68%. This finding was supported by many other researchers [11,17,19]. The samples collected from the different areas were generally poor in their organic matter content compared with other cultivated areas, which have clay or silt nature, and there was no big difference between the areas. This might be attributed to the sandy nature of these areas. Moisture content of the samples was also relatively low ( %). This is in agreement with desert characteristics. ph values of all samples were alkaline ( ). In this respect, Egyptian was mentioned in most areas as alkaline [17,19]. The amount of Ca 2+, Mg 2+, Na +, and K + in tested samples was wide ranged. The amount of Ca 2+, Mg 2+, Na +, and K + contents in dry varied between 20 μg/g, 3 10 μg/g, mg/g, and mg/g, respectively, in all samples tested of the four localities. This is almost in agreement with the results previously obtained from Egyptian s [11,17]. Several investigations mentioned that fungal population in a certain is more influenced by several factors such as its salt content, organic matter content [5], water content, ph value, and the type of. Seventy-two species and six species varieties belonging to 32 genera of fungi were collected from GH (17 genera and 28 species+2 varieties), from WA (21 genera and 37 species+1 variety), from PF (29 genera and 56 species+3 varieties), and from PR (18 genera and 33 species+3 varieties) on glucose- Czapek s agar at 28±1 o C. The results obtained from the four localities were similar, and the most common genera were Aspergillus, Emericella, Penicillium, and Chaetomium. They emerged from 100, , , and % of the samples comprising , , , and % of total fungi, respectively. The most common species was A. terreus and its natural products of medical importance were reported by many other researchers [42,43], followed by E. nidulans that also produces some bioactive metabolites [44] and then P. chrysogenum, which was reported to have some important bioactive metabolites [45]. In contrast, some species were common only in one or more of the four localities tested, such as A. flavus in GH, PF, and PR; B. piluliferum in WA and PF; A. ustus, F. oxysporum, F. solani, and R. stolonifer in PF; S. chartarum in PR; and A. sydowii in WA. Most of the above species were also common in s previously tested and gathered from different localities in Egypt [9,12,16,19]. Conclusion This survey discussed the basic similarities between fungi associated with the different localities (PR, GH, WA, and PF). There are no specific fungal flora characteristics for each locality. In addition, no considerable differences between the mycobiota recovered from one locality to another were detected. Comparative study of the genera and species for the different localities showed that they could differ in the numbers and frequency of occurrence.
6 Diversity of fungi Zohri et al. 63 Acknowledgements Conflicts of interest There are no confl icts of interest. References 1 Cavalcanti MA, Fernandes MJ, Lima DM. Diversity of fi lamentous fungi isolated from the in the semiarid area, Pernambuco, Brazil. J Arid Environ 2013; 95: Porras-Alfaro A, Herrera J, Natvig DO, Lipinski K, Sinsabaugh RL. Diversity and distribution of fungal communities in semiarid grassland. Mycologia 2011; 103: Hudson HJ. Fungal saprophytism. London: Edward Arnold Limited; Ali MI. On the fungal fl ora of Saudi Arabia. 1-Wadi Hanifa. Bull Fac Sci Riyad Univ 1977; 8: Moubasher AH, Mazen MB, Abdel-Hafez AI. Some ecological studies on Jordanian fungi. I-Records of mesophilic fungi Naturalia monspeliensis. Serie Bot 1977; 27: Abdel-Hafez SI. Phyllosphere and phylloplane fungi of wheat cultivated in Saudi Arabia. Mycopathologia 1981; 75: Halwagy R, Moustafa AF, Kamel SM. Ecology of mycofl ora in the desert of Kuwait. 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